Yosoo Remote Wireless Microphone Headset Stage MIC Receiver + Microphone Transmitter Lavalier for Aerobics, Churches, Schools, Speeches, Lectures, Meetings(Not Include Battery) Enjoy the freedom of wireless speaking anywhere with the Wireless Headset Microphone. The receiver battery is double A, Microphone battery is the model 6F22. Clip-on Lapel Microphone free your hands (Not Included Batteries) Just connect the receiver to any amplifier and you can communicate wirelessly up to 100 ft Perfect wireless microphone for teaching, meetings, presentations, running a show or any where you need a hands free microphone This is very light weighted and portable to take it anywhere with you.